3,546 articles
American Highland
American Highland, interior plateau of eastern Antarctica between Enderby Land and Wilkes Land, inland of Ingrid Christensen Coast; ice-capped upland about 2,000–3,000 m high, discovered and named by Lincoln Ellsworth in 1939.
Amiot Islands
Amiot Islands: islet group with Cumbers Reef and Ward Islands off SW Adelaide Island, Antarctic Peninsula; charted by Charcot's FrAE 1908-10, named for A. Amiot of Montevideo; also Îles Amiot, Islas Amiot, Amiot Reef.
Amlia Island
Amlia Island is an uninhabited island near the east end of the Andreanof group of the Aleutian Islands, Alaska, adjacent to Atka Island, about 72 km long.
Ammassalik Ø
Ammassalik Ø (Ammassalik Island, formerly Angmagssalik Island) is a large island on southeast Greenland's coast, site of Tasiilaq, East Greenland's largest town; named for capelin (ammassat), with uplifted-margin relief and Little Ice Age glacial history.
Amud
Amud Cave, a Middle Paleolithic Neanderthal site in Nahal Amud, northern Israel; excavated 1961, 1964, and the 1990s; yielded Amud 1 (1,740 cc cranium) and the infant Amud 7, dated 70–53 ka.
Amund Ringnes Island
Amund Ringnes Island is an uninhabited island in Nunavut, Canada, covering 5,255 km² in the Canadian Arctic Archipelago, discovered in 1901 during Otto Sverdrup's second Fram expedition.
An Nafud
An Nafud (al-Nufud al-Kabir, Great Nafud) is Saudi Arabia's second-largest sand sea, about 65,000 km² across Hail, al-Jawf, and Tabuk provinces, with red iron-oxide dunes up to 200 m, mostly stable, and Pleistocene lake and human-occupation records.
Anamudi (ആനമുടി)
Anamudi (ആനമുടി), also known as Anai Peak, is a mountain in Kerala, India, whose name means "elephant's head" and is the highest point in the Western Ghats.
Anchialine system
An anchialine system, also called an anchialine pond, is a coastal body of groundwater in caves or pools, linked to the sea underground and rising and falling with the tide.
Ancohuma
Ancohuma, also known as Janqutma, is a 6,427 m snow peak in Bolivia's Cordillera Real, rising above Sorata. It is the range's second-highest peak, following its neighbor Illampu.
Andaman and Nicobar Islands (अंडमान और निकोबार द्वीपसमूह)
Andaman and Nicobar Islands (अंडमान और निकोबार द्वीपसमूह), also called A&N Islands or ANI, an Indian union territory of 8,249 km² in the Bay of Bengal: 836 islands in two groups split by the Ten Degree Channel, capital Sri Vijaya Puram, penal-settlement and Japanese-occupation history, and five vulnerable tribal groups.
Anderson Summit
Anderson Summit is a 2,810 m peak in the Thiel Mountains, Antarctica, near Ford Massif at 85°03′S 090°53′W, with 530 m prominence and 222.5 km isolation; nearest higher neighbor Mount Schopf.
Andersson Island
Andersson Island, also called Andersson Isla and formerly Uruguay Island, is an Antarctic island about 9 miles long near the south entrance to Antarctic Sound, renamed for Swedish geologist J. Gunnar Andersson of Nordenskjöld's 1901-04 expedition.
Andes
The Andes are Earth's longest terrestrial mountain range and second highest after the Himalayas, running the length of South America. Formed by subduction of oceanic crust beneath South America, they host the Altiplano-Puna plateau and feed the Amazon.
Andros
Andros is the largest island of the Bahamas (about 5,959 km²), an archipelago of North Andros, Mangrove Cay, and South Andros with under 10,000 people, the country's largest freshwater aquifer, over 180 blue holes, and the world's third largest barrier reef.
Anegada
Anegada, also called the flat coral and limestone island of the British Virgin Islands, is the territory's second largest island at 38 km2, lying 24 km north of Virgin Gorda behind Horseshoe Reef, with Ramsar wetlands and the Critically Endangered Anegada rock iguana.
Angeac-Charente Formation
Angeac-Charente Formation: Early Cretaceous lignitic bone bed in a Charente quarry, France, discovered 2008, dated ~140 Ma (Berriasian), a fossil-Lagerstätte with sauropods, ornithomimosaur herd, and 6,000 coprolites.
Angelins Bjerg (HP Ymers)
Angelins Bjerg (Angelin Bjerg, Angelins Bjærg) is the high point of Ymer Island, East Greenland, about 1,900 m with 1,900 m prominence, an ultra at 73°10′N 24°19′W.
Angilaaq Mtn.
Angilaaq Mountain is an officially named summit in Nunavut, situated on Bylot Island within the Arctic Cordillera's Byam Martin Mountains. It reaches an elevation of over 1,939 m.
Anna Maria Island
Anna Maria Island is a 7-mile Florida Gulf barrier island in Manatee County with three cities, no high-rises, a free trolley, Bean Point, and beaches hit by Helene, Milton, and red tide.
Annamite Range
The Annamite Range, or Annamese Cordillera, is a principal mountain range in Southeast Asia, extending 1,130 km and featuring Phou Bia as its highest peak.
Annapurna (अन्नपूर्णा)
Annapurna (अन्नपूर्णा), a Himalayan massif in north-central Nepal; Annapurna I (8,091 m) is the world's tenth highest peak and the first 8,000 m mountain climbed, by Herzog and Lachenal in 1950, and remains the deadliest eight-thousander.
Annapurna I
Annapurna I (8091 m), Nepal Himalaya, 10th highest mountain; first 8,000-metre peak climbed, on 3 June 1950 by Maurice Herzog and Louis Lachenal of France; highest deaths-per-summit ratio among Nepal's 8,000ers.
Annapurna II
Annapurna II, 7,937 m, eastern anchor of Nepal's Annapurna massif and 16th-highest peak, first climbed May 17, 1960 by Grant, Bonington, and Ang Nyima Sherpa via the west ridge.
Annette Island
Annette Island (Tàakw.àani) is an island in the Alexander Archipelago, southeastern Alaska, south of Ketchikan. Home to Metlakatla and the Annette Islands Reserve, the only federal Indian reservation in Alaska, reserved for the Tsimshian by Congress in 1891.
Antarctic ice sheet
The Antarctic ice sheet, also called the Antarctic ice cap, is the ice mass covering almost all of Antarctica, holding about 58 meters of potential sea level rise.
Antarctic Plateau
The Antarctic Plateau, also called the Polar Plateau or East Antarctic Plateau, is the vast, elevated interior ice surface of East Antarctica, among the coldest places on Earth.
Antelope Canyon
Antelope Canyon (Tsé bighánílíní) is a Navajo Sandstone slot canyon on Navajo Nation land near Page, Arizona, toured only with authorized Navajo guides; Upper has midday light beams, Lower has ladders, and a 1997 flash flood killed 11.
Antelope Valley
Antelope Valley: 3,000-square-mile high desert closed basin in the western Mojave, Los Angeles and Kern counties, California; cities Lancaster and Palmdale; agriculture-to-aerospace economy, Edwards AFB, adjudicated groundwater basin.
Anti-Atlas
The Anti-Atlas is a 600-plus-km ENE-trending mountain range in southern Morocco on the northern edge of the West African Craton, reaching 3305 m at Jbel Sirwa, shaped by Pan-African, Variscan, and Cenozoic events plus mantle-driven uplift.